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Patent US4349949A successfully refreshed from Google Patents.
US4349949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making heat exchangers
Assignee: Peerless of America Inc
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Filing: 1980-11-05
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Granted: 1982-09-21
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Expires: 2000-11-05
Abstract
Abstract The method of making elongated heat exchangers having outwardly projecting fins spaced longitudinally thereof, wherein the fins are cut or gouged from a work-piece while the work-piece and cutting tool are vibrated relative to each other to afford roughened surfaces on both faces of the fins facing longitudinally of the heat exchanger.
Inventors
- 👤 Richard W. Kritzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:00
CPC Classifications
F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/24; F28F1/26; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/20; B21D; B21D31/00; B21J; B21J5/00; B21J5/06; B21J5/068; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49377; Y10T29/49378; Y10T409/00; Y10T409/50; Y10T409/50082
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
109 words
The method of forming fins on the surface of a heat exchange element which comprises the steps of (a) feeding an elongated tubular body member longitudinally past a cutter, (b) reciprocating said cutter forwardly and rearwardly toward and away from said surface at an acute angle and cutting into said surface during the forward movement thereof in a skiving action, thereby to form an upstanding fin, one side of which is integral with said body, and (c) imparting relative vibration between said cutter and said body during said forward movement of said cutter, (d) thereby to produce a roughened surface on the cutter-adjacent side of the fin thus formed.
Claim 2
Independent Claim
109 words
The method of forming fins on the surface of a heat exchange element which comprises the steps of (a) feeding an elongated tubular body member longitudinally past a cutter, (b) reciprocating said cutter forwardly and rearwardly toward and away from said surface at an acute angle and cutting into said surface during the forward movement thereof in a skiving action, thereby to form an upstanding fin, one side of which is integral with said body, and (c) imparting relative vibration between said cutter and said body during said forward movement of said cutter, (d) thereby to produce a roughened surface on the cutter-adjacent side of the fin thus formed.
Claim 3
Dependent Claim
34 words
The method of forming fins on the surface of a heat exchange element as defined in claim 1, wherein the relative vibration between said cutter and said body is caused by vibrating said cutter.
Claim 4
Dependent Claim
34 words
The method of forming fins on the surface of a heat exchange element as defined in claim 1, wherein the relative vibration between said cutter and said body is caused by vibrating said body.
Claim 5
Dependent Claim
42 words
The method of forming fins on the surface of a heat exchange element as defined in claim 1, wherein the relative vibration between said cutter and said body is in a direction transverse to the movement of said cutter and said body.
Claim 6
Dependent Claim
35 words
The method of forming fins on the surface of a heat exchange element as defined in claim 2, wherein the vibratory motion of said cutter is in a direction transverse to the cutting movement thereof.
Claim 7
Dependent Claim
38 words
The method of forming fins on the surface of a heat exchange element as defined in claim 3, wherein the vibratory motion of said body is in a direction transverse to the direction of feed of said body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-20 | 1986-03-22 | 1986-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-20 | 1990-03-22 | 1990-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-20 | 1994-03-22 | 1994-09-21 | $7700.00 | Window Closed / Lapsed |